Abstract
We report a simple, one-pot, and metal free benzannulation protocol to carbazoles starting with indoles, carbonyl compounds and an appropriate dienophiles. Mechanistically, this strategy generates an in situ diene by condensation between indole and carbonyl compound succeed and subsequent dehydration. Later, Diels–Alder reaction of this diene with a suitable dienophile followed by oxidation delivers the carbazole derivative. This methodology provide an easy access to carbazoles containing 1,4-naphthoquinone moiety.
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